1. Start the Microsoft Management Console. On the Console menu, click Add/Remove Snap-in.
2. Add the Group Policy Object Editor snap-in for the default domain policy. To do this, click Browse when you are prompted to select a Group Policy Object (GPO). The default GPO is Local Computer. You can also add GPOs for other domain partitions (specifically, Organizational Units).
3. Open the following sections: User Configuration, Administrative Templates, Windows Components, and Windows Explorer.
4. Click Hide these specified drives in My Computer.
5. Click to select the Hide these specified drives in My Computer check box.
6. Click the appropriate option in the drop-down box.

The guy who did this probably did what Microsoft recommends *not* to do: he edited the %Systemroot%\inf\system.adm file on his machine, created the GPO, and the customized adm got updated by a service pack.
Make a backup of the GPO using the GPMC before you start with the following.
Use the GPMC to find the GPO's GUID; in the policies folder, check the subfolder named with this GUID for the subfolder "Adm". In the adm folder, open system.adm in Notepad, and search for "!!ABOnly" (can appear several times); check if you see the "31" (which hides A through E) as VALUE NUMERIC in this policy block.
If so, copy that system.adm to your workstation, rename it to system-temp.adm or whatever. Start the GP editor, unload system.adm (right-click "User Configuration\Administrative Templates"), load your system-temp.adm instead. You should now be able to set the "Hide Drives" policy back to "Not configured" (don't change anything else). Close the GP editor, open it again. Remove the system-temp.adm file, add the original system.adm, and you should now be able to set the "Hide Drives" value to your likings.

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